tweaks for a video game server

ok dude's and dudets i am doing a lan party and we had a critical error on our server and i need it running prefect in 24 hhours. i hvae win xppro and that is it, the ganes running on it are ET UT UT2K3 and CS, now the hardware is a DFI lan party mobo via ktv400 chipset, amd xp 2500 1gb of ram. raided 2 40gb hdd's. now can you ntfs people help me as u have in the past and give me some good tweaks for a lan party server?????